Paul Caneiro, 51, faces four counts of murder in connection with the deaths of his 50-year-old brother and business partner, Keith; 45-year-old sister-in-law, Jennifer; and his nephew, Jesse, 11, and niece, Sophia, 8 — who were found dead last week in their Colts Neck home, which was then set on fire, according to warrants entered into Superior Court of New Jersey records Thursday morning.

“The state alleges the defendant murdered his brother Keith Caneiro and his entire family,” Monmouth County Prosecutor Christopher Gramiccioni said during a press conference announcing the charges.

Caneiro’s motivation was “financial in nature, stemming from his and the victims’ joint business ventures,” Gramiccioni said.

Caneiro killed his own brother in a hail of bullets outside Keith’s home, Gramiccioni said.

He then went inside and stabbed Jennifer before “repeatedly” stabbing both Jesse and Sophia. The mother and children’s manner of death is still pending a toxicology report, Gramiccioni said.

In addition to the murder charges, Caneiro faces a new count of aggravated arson and two weapons charges, for allegedly using a gun and a knife in the slayings.

He faces a maximum life in prison if convicted, Gramiccioni said.

Caneiro had previously been charged with arson for setting fire to his own home in Ocean Township with his wife and two daughters inside. No one was injured in that blaze, which broke out hours before the one in Colts Neck.

Caneiro set the Colts Neck fire in the basement. But when he torched his own Ocean Township home, he set two fires on the extremities of the building “for the purpose of both destroying evidence of his earlier crimes in Colts Neck and to also create the illusion that the overall Canerio family was somehow targeted,” Gramiccioni said.